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Segment Information (Segment Reconciliation to Totals reported in the accompanying Consolidated Financial Statements) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating income	$ 11,716	$ 12,523	$ 9,607	$ 10,661	$ 14,530	$ 7,335	$ 7,391	$ 5,496	$ 44,507	$ 34,752	$ 22,827
Other general and administrative expenses									80,044	61,421	55,320
Depreciation and amortization									12,051	10,574	8,642
Interest income									(624)	(1,523)	(2,592)
Interest expense									3,189	3,105	5,016
Income from continuing operations before income taxes									41,942	33,170	20,403
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating income									$ 136,602	$ 106,747	$ 86,789

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